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Elongation of roots of cytokinin-receptor mutants in the presence of increasing concentrations of BA. Root length of each genotype without cytokinin was set at 100%. Lengths of roots in the absence of BA were: WT, 2.58 ± 0.29 (mean ± SD); cre1–12, 2.65 ± 0.32; ahk2–2, 2.18 ± 0.28; ahk3–3, 2.81 ± 0.38; cre1–12 ahk2–2, 2.57 ± 0.38; cre1–12 ahk3–3, 3.01 ± 0.35; ahk2–2 ahk3–3, 2.69 ± 0.35; and cre1–12 ahk2–2 ahk3–3, 0.65 ± 0.09.
